Incandescent lamp



Sept. 9, 1924- 1,508,302

' c. c. SCHNUR INCANDESCENT LAMP Filed Sept. 22, 1922 WITNESSES l/VVE/VTOR 62/128 yQ/(wm/z C/mm 4 TTOR/VEVS Patented Sept. 9, 1924.

umrso STATES PATENT OFFICE.

OYBIJL COLEMAN SCHNUB, OF TORONTO, ONTARIO, CANADA.

INOANDESOENT LAMP.

Application filed September 22, 1922. Serial No. 589,894.

An object of the invention is to provide 0 an efiicient lamp of simple construction,

wherein the filament member is supported b and insulated from aleading-in mm in sue a manner as to form a flexible unit support which lessens the possibility of damage to the filament by shocks to which the lamp is some times subjected.

Another object is to provide a filament for. an incandescent lamp which extends in a straight line coincident with the longitudinal axis of the lamp, and which is supported intermediate its ends.

Still another object is to provide a sup port for the filament that allows relatively smaller bulbs to beused.

The above and other objects will appear more clearly from the following detail description, when taken in connection with the accompanying drawing, which illustrates preferred embodiments of the inventive idea.

In the drawing- Figure 1 is a fragmentary longitudinal 1 section through an incandescent lamp constructed in accordance with the invention;

Figure 2 is an enlarged view partly in section showing a slightly different manner of securing the filament to the insulators;

Figure 3 is a view similar to Figure 1 illustrating the invention in erspective and showing a difierent form t ereof adapted for the accommodation of longer filaments; and

Fi re 4: is a View similar to Figure 3 showlng another different form adapted for the accommodation of short bulbs or for the usual bulb having the filament placed at the extreme inner end thereof, the use of the small bulb being indicated in dotted lines.

Referring more particularly to the drawings, the numeral 3 indicates the bulb of an incandescent lamp, having a stem 4 projecting into the neck thereof and carrying adjacent ends of the leading-in wires 5 and 12. The portion of the wire 5 adjacent the stem 4 is bent at an acute'angle with re spect to the longitudinal axis of the lamp and the remainder of said wire is bent to provide portions 6 and 7, the former bein disposed transversely with respect to said longitudinal axis, while the latter are arranged m a plane parallel to said axis and alfternately disposed on opposite sides there- Each of the portions 6 of the leading-in wire 5 has mounted thereon an insulating sleeve 8, preferably made of fused silica, which is employed to support a filament 9 and insulate the same from the leading-in wire 5. Each sleeve 8 is loosely mounted upon its portion 6 of the leading-in wire and is limited with respect to a lon itudinal movement thereon by the portions of said wire. 4 The leading-in wire 12 is looped around the adjacent sleeve 8 and continued a short distance farther, engaging with one end of the filament 9. It will be understood that as many insulating sleeves 8 may be employed as is found desirable.

The filament 9 is preferably formed of a single length of wire having its outer end secured to the end of the leading-in wire 12 and the remaining portion thereof ex tending inwardly into the bulb 3 in a plane coincident with the longitudinal axis of the lamp. As shown in Figure 1, the intermediate portions of the filament 9, which is preferably a universal gap filament, are given a turn, as indicated at 10, about the insulating sleeves 8 to secure the filament thereto so that the same will be supported by said sleeves in its proper position. The end of the filament 9 opposite that end which is attached to the leading-in wire 12 l is secured to the adjacent end of the leading-in wire 5 in any preferred manner. In Figures 2, 3 and 4, the filament 9 is shown as being secured to the sleeve 8 by means of a tie wire 13 which is given a single turn about the sleeve and filament.

In addition to the construction shown in Figure 1, the leading-in wire 5, as illus trated in Figure 3, is made considerably longer and is bent intermediate its ends to provide the portion 11 which extends transversely with respect to the portions 7 and the longitudinal axis of the lamp. The remaining portion of said leading-in wire 5 is then extended toward the outer end of the bulb 3 in parallel relation to the other portion thereof. The filament 9, in this embodiment, is also made longer and an intermediate portion thereof is extended in a transverse plane with respect to the longitudinal axis of the bulb and between the insulating sleeves 8 which are mounted on the portions 6 contiguous to the portion 11. This arrangement of the filament permits of light being projected in a downward direction as well as to both sides.

The construction shown in Figure 4 is precisely the same as that of Figure 3, except that the leading-in wire 5 and filament 9 are shorter in length and the number of portions 6 and 7 are reduced so that the support and filament may be accommodated to a lamp having a smaller bulb as shown in dotted lines, or to a bulb of usual size with the filament arranged at the extreme inner end thereof.

From the foregoing description it will be apparent that the invention provides an incandescent lamp having a concentrated filament which is supported within the bulb of the lamp in such a manner that the heat radiating from the filament will be more evenly distributed in the bulb. It will also be apparent that the invention provides a simple and eflicient means in the form of a flexible unit support for securely supporting the filament within the bulb and insulating the same from the leading-in wire.

What is claimed is:

1. In an incandescent lamp, a flexible unit support including a leading-in wire having portions thereof arranged transversely with respect to the longitudinal axis of said lamp and other portions disposed in parallel relation to said axis and alternately arranged on opposite sides thereof, and a filament for said lamp arranged in a straight line coincident with the longitudinal axis of the lamp and supported by said leading-in wire.

2. In an incandescent lamp, a flexible unit support including a leading-in Wire hav-' ing portions arranged transversely with respect to the longitudinal axis of said lamp, and other portions disposed in parallel relationthereto, and a filament for said lamp arranged in a straight line coincident with said axis and supported by the transverse portions of said leading-in wire.

3. In an incandescent lamp, a flexible unit support including a leading-in wire having portions arranged transversely with respect to the longitudinal axis of said lamp, insulating elements carried by said transverse portions, and a filament arranged in a straight line coincident with said axis and having intermediate portions thereof secured to said insulating elements.

4:. In an incandescent lamp, a flexible unit support including a leading-in wire having neosgeoe supporting portions, fused silica sleeves mounted on said portions, and a filament having portions wound about said sleeves.

5. In an incandescent lamp, a flexible unit support including a leading-in wire having portions thereof arranged transversely with respect to the longitudinal axis of said lamp, and other portions disposed in parallel relation to said axis and alternately on' opposite sides thereof, insulating elements mounted upon said transverse portions and limited in their movements thereon by said parallel portions, and a filament arranged in a straight line coincident with said axis and having intermediate portions secured to said insulating elements, whereby the filament is supported in position within said lamp.

6. In an incandescent lamp, a flexible unit support including a leading-in wire having portions thereof arranged transversely with respect to the longitudinal axis of said lamp and another portion arranged transversely both with respect to said axis and the first named portions, other portions of said wire being disposed in parallel relation to said axis, and a filament supported by said wire.

7. In an incandescent lamp, a flexible unit support including a leading-in wire bent intermediate its ends to provide parallelly extending sections, each of which has portions extending transversely with respect to the longitudinal axis of said lamp and other portions disposed in parallel relation to said axis, and a filament supported by certain portions of said wire.

8. In an incandescent lamp, a flexible unitsupport including leading-in wires, one of which is provided with a portion arranged transversely with respect to the longitudinal axis of said lamp and another portion parallel to said axis, an insulating element mounted on said transverse portion and to the. intermediate portion of which the other leading-in wire is connected, and a filament secured to the ends of said leading-in wires.

9. In an incandescent lamp, a flexible unit support including leading-in wires of different lengths, one of said wires being provided with a portion arranged transversely with respect to the longitudinal axis of said lamp and another portion parallel to said axis, an insulatingelement carried by said transverse portion and about which the other leading-in wire is wound, and a filament secured to the ends of said wires and extending parallel to said other portion of the first named wire.

10. In an incandescent lamp, a flexible unit support including leadin-in wires, an insulating element carried by one of said wires and about the intermediate portion of which the other wire is wound, and a filament supported by said leading-in wires.

11. In an incandescent lamp, a flexible unit support including leading-in wires of diflerent lengths, an insulating element carried by the longer wire and about which the shorter wire is wound, and a filament con- 5 nected to the ends of said leading-in wires.-

12. In an incandescent lam a flexible unit support including a lea g-in wire having portlons thereof arranged transversely with respect to the longitudinal axis of said lamp and other portions thereof disposed in parallel relation to said axis, insulating elements carried by the first named portions and a filament having intermediate portions thereof encircling said insulating elements.

GYRIL COLEMAN SCHNUR. 

